SOLUTION: On the first day of school, the percentage of boys in a particular class is 60%. During the school year, six girls move away, and are replaced in the class by six boys; this makes

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Question 193130: On the first day of school, the percentage of boys in a particular class is 60%. During the school year, six girls move away, and are replaced in the class by six boys; this makes the class roster 75% boys. Find the number of boys and girls in the class on the first day of school.
Answer by Mathtut(3670) About Me  (Show Source):
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if c = total number in the class
:
g=the number of girls
:
g=.4c.....eq 1
:
g-6=.25c..eq 2
:
.4c-6=.25c
:
.15c=6
:
c=40
:
g=.4c----->g=16 girls
:
b=.6c---->b=24 boys